FORAGE SORGHUM TOLERANCE TO PRIMESTRA SC HERBICIDE

• Published in: Revista Brasileira de milho e sorgo Vol. 1; no. 2; pp. 59 - 66
• Main Authors: DÉCIO KARAM, LINO ROBERTO FERREIRA, ANTÔNIO ALBERTO DA SILVA, ELIANE REGINA ARCHANGELO, JOÃO BAPTISTA DA SILVA
• Format: Journal Article
• Language: English
• Published: Associação Brasileira de Milho e Sorgo 01-08-2002
• Subjects: atrazine; metolachlor; selectivity; Sorghum bicolor; toxicity
• ISSN: 1676-689X; 1980-6477

With the objective of evaluating the forage sorghum tolerance to Primestra SC(200 g l-1 of atrazine + 300 g l-1 of metolachlor), a greenhouse experiment was conducted atEmbrapa Milho e Sorgo, Sete Lagoas, MG. The treatments were four Primestra SC rates(3,0; 6,0; 9,0 and 12,0 l ha-1) with or without Assist (mineral oil) at 1,5 l ha-1 sprayed at threesorghum (AG 2002) stages (two, four and six leaves). The experimental design was factorialwith the addition of a non-treated control for each spray stage added in a randomized completeblock with four replications. Visual evaluation of toxicity was done at 7, 14, 21 and 28 daysafter application (DAA). Plant height and root and shoot dry weight were evaluated. Plantssprayed with Primestra SC with Assist showed greater toxicity than plants sprayed withPrimestra SC without Assit meanly at higher rates. Earlier application of Primestra SC had higher toxicity values than later application. Sorghum plants recovered with time to all rates ofPrimestra SC sprayed independently of stage application.